Process of enriching metallic sulfids.



UNITED STATES PATENT OFFICE.

HUGO PETERSEN, OF LAZYHPTTTE, GERMANY.

PROCESS OF ENRICHING METALLIC SULFIDS.

sPEcIFIoA'rIoN forming part of Letters Patent No. 657,955, datedSeptember 18, 1900.

Application filed Jul 5. 1399. Serial No. 722,861. No specimens.)

To all whom it may concern.-

Be it known that I, HUGO PETERSEN, engineer, of Lazyhiitte, nearBurhatz, in the Province of Silesia, German Empire, have invented somenew and useful Improvements in Processes of Enriching Metallic Sulfids;andI declare that, the following is a full and clear descriptionof-same.

The purpose of the present process is to 1 separate the metallic sulfidsfrom the carcarbonates of the alkaline earths, which'are decomposed intoacid or neutral sulfites,which remain dissolved in the sulfur-oussolution,

CO being disengaged. After the alkaline earth has been completelydissolved the so lution is run off and the ore thus dressed purified bymeans of water. The metallic sulfids are not attacked by this treatment,so that the dressing process involves no loss of ore.

I claim- The herein-described process of enriching metallic sulfidswhich are mixed with carbonates of the alkali-earth metals consisting indissolving out the carbonates with an aque-- ous solution of sulfurousacid, substantially as described".

y In witness whereof I have hereunto set my hand in presence of twowitnesses.

HUGO PETERSEN.

Witnesses:

WILHELM WEIDNER, HERMANN BARTSCH.

